High operating costs and low oil prices caused oil and gas production from the St. James lease to be shut in early 1998. The St. James lease is located in the Las Cienegas field in an historic area of Los Angeles California approximately two (2) miles from the downtown Civic Center. The principal goal of this DOE project is to show how long-term shut-in oil and gas wells can be returned to profitable operation. This goal is aided by improved oil and gas prices and the use of modern stimulation technology. Low oil and gas prices in 1998-1999 led to thousands of oil wells being shut-in throughout the United States. Based upon the premise that oil and gas prices will remain relatively stable in the future, revitalizing shut-in oil and gas wells is now an attractive option for many operators. The effort and expense required to return a shut-in well to production depends, to a large extent, on its condition at the time of shut-in and the efforts taken to preserve the well's productivity while it was shut-in. Obviously, if a well was shut-in because of an equipment failure (tubing leak, pump failure, etc.), the mechanical problem must be corrected first. However, wells with no obvious problem at the time of shut-in other than poor economics ,most likely have developed problems during the shut-in period. St. James? experience has indicted that wells in the Las Cienegas field, which have been shut-in for a long period of time, in this case more than seven (7) years and are returned to production often produce at a rate of 30-50% less than prior rates. Scale deposition caused by filtrate invasion has been found to be the major damage mechanism. Other production-impairment mechanisms are believed to be fines migration and clay dispersion and swelling.